Slitting mechanism.



securing bolts` and through unch set. ack rows of cutters showing two ol' t l 'UNITED STATES PATENT oEEroE,

NORRIS ELMORE CLARK, OF PLAINVLLE, CONNECTICUT.

SLITTING- MECHANISM. y

To all whom 't may concern."

Beit known that I, N onlus ELMORE CLARK, a 'citizen .of the United Statea, residing at Plainville, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Slitting echanism,lofwhicl1 the following is a speeication. My invention relates to mechanism for slitsheets or plates, particularly ting or lancing ofmetal.

The mainfobject is to provide sim le 'and reliable mechanism for forming refatively staggered slitsin sheet metal, and leaving it .15 "substantially flat so that the product may be by suit'- subsequently stretched or expanded anism. Iliave also sought to perable mech feet the details of construction whereby thev cuttersmay be readilyr manufactured, in-

stalled, adjusted, removed and kept in working condition.

' Another object is tol prevent yielding of the cutters when in operation and 'any consefuent irregularity in the product.

he mechanism 1s adapted to be installed and used in a `suitable reciprocatingr press vwith suitable feed rolls or other devices such as are in common use.

The accompanying two illustrate detalls ot on'e form of the lnvention.

Figure. 1. is a view of the under sidee'ftile unch member, part being shown in section. ig. 2. is a plan view ofthe die member, part being shown in section. Fig. 3. is a detail view showing a fragment of the product of the mechanism.` Fig. 4. is a cross section Ll view of theentire mechanism on the plane of the line XX-of Figs. 1 and 2. Figs. 5. ano 6.

are side and sectional views respectively oi' a cutter such isused in the die set and in tl ie front'row of the punclrset. Figs. 7. and f4.

are side and sectional views respectively oi' a cutter such as is used in the back -row ol' tl c Fig. 9. is a front view of ti e through bolts in section. Fig. 10. is a frm t view of the front rows of cutters showing tl ye bolts in section. The punch-holder 1 is secured in suital le manner to the reciprocating gate or heid 2,

while the die holder 3 is secured to the sl..

tionary bed or frame 4. The stock 5, for in.,- stance, sheet steel, is fed intermittently over a table 6,- and transverse rows of slits such as Specification of Letters Patent. Application led November 13, 1907.

form ed sheets of drawings v23,231, and nuts 24, 24.

' Patented Aug. 10, 1909. serial No. 401,934.

one row being staggeredlatcrally with relation to the slits in the adjacent rows. All the slits in row.7 are formed by the front rows of vcutters at the same time that the slits in row 8 are formed by the back rows of cutters. along step by step in the direction of the arrows in Figs. 3 and 4, all the succeeding slits in column 9 are formed ie same upper and lower pair of bacio` cutters,

by a single pair of up er and lower front cutters as will be more from the following detail description. The feed after each stroke is equal to the distance between slits of a column and the distance betweeny the cutting edges of the front'and back cutters is equal to two and a half times the feed.

`The holders 1 and Slare formed from solid castings with transverse grooves for receiving the cutters. These grooves have parallel sides 11, 12, 13, 14, and the cutters are )erfectly flat so that the alinement is per ect. lAll the die cutters 15, 15, and 16, 16, are like cutter15, shown in Figs. 5 and 6 except that some of them are centrally perforated ,as will be'hereafter understood. The cutting edge 17, is straight and equal to the length of the slit desiredI Thefac of the cutter is beveled as shown at 1S Fig. 6, so as to facilitate a shearingcut. The ends of the cutters abut against one another so that the 'I'iositionof each cutter is readily'determilied. Each corner ofthe cutting face is beveled as at 19 so as to prevent cutting the bonds. [i recessZ() is formed iu cach. end toallow for the clamp bolts 21,21. clamp bolt is inside the groove of theholder and operates against the two adjacent cutters so that each cutter is clamped securelyr on both ends. '.lhecuttm's 16, 16, are s'ecured in thc same manner by bolts such as Some of thesebolts, such as 25, pass through the holder and the front cutters 15, and are provided with iutermediate nuts such as 27, so as tov tie the and prevent the parts from springing. bar 2S spaces the rows.; ol' serves to protect the A the die cutters and vnuts between thc rows.

All the cutters lll), 30, of the front row ol punch cutters are like die cutter 1 held in place by bolts 31, 31, in the same manner as the lic cutters.

7 and 8 are formed by the cutters, the slits in and all the lslitsin column 10 are fu yunderstood lhe nut 22 for each 1 such as 26 and exterior nuts lolder together 5, and are l'lO .which is onlyT provided in the back cutters others are simply held in place by the bolts ters, but thecutting edge has a short,

All the cutters 32, 32, of th'elback row of punch cutters are like the cutter shown in Figs. 7 and 8 except for the perforation 33,

relation, the cutting edge of each cutter in all four iows being straight, across at least its central portion.

5. Slitting mechanism comprising two rows oll punch cutters and two iows of die cutters all arranged in transversely staggered relation, the cutting edge ol each cutter in. all l'our rows being straight, across at least its central portion, the cutting edge ol' each eiltter in one ol` the back rows being also sloped awaj,r from the straight central portion toward the ends. v 6. Slitting mechanism comprising spaced rows ol punch and die cutters in transversely staggered relation each cutter in all the rows being beveled on the corners and having a cutting lace with an edge straight across a portion oi' it. A

7. In' slitting mechanism a rigid holder where the through bolts 34, 34, pass. The

35, 35, which pass between the ends of the adjacent cutters and have clamp nuts 36, 36. The through bolts 34, 34, have interior nuts 37, 37, and exterior nuts 3S, 38. n. space bar 39 is located. between the front and back punch cutters. lThe coiners of each bacl;

unch cutter are beveled as at llfOand the s tace beveled as at 41 similar to the other cutstraight portion 4:2, Aand is sloped oil or crowned as at 43, 43. These back punch cutters 32, 32, in conjunction with the bael; die cutters 16, 16, act upon the solid stock,

and I have found that the shape of the eiithavinga transverse groove, two rows of ilat ting faces and edges produces a clean cut cutters arranged in said groove in staggered h?? relation, a space bar between the rows and means for holding the cutters in place.

S. Slitting mechanism including a holder having a groove with straight parallel walls, two rows ol ilat cutters arranged in staggered relation in said groove, each cutter abutting against the ends ol' the adjacent cutters and being beveled on the corners and straight across a portion.

9.' Slitting mechanism inehiding a holder haviuga transverse groove with straight parallel walls, two rows ol staggered ilat cutters and means l'or clamping each cutter in place Without injury to the stock and without inaterial bending of the strands.

After the ba :k cutters have formed rows of slits as shown at the lower edge of Fig. 3, the stock comes under the action ofthe front punch cutters 30, 30, and die cutters 15, 15, which s I`lit the ends of the strands formed by the-ljack cutters and thus form the desired substantially flat product .with relatively staggered slits as shown in the upper part of Fig. 3.

Although the operation of this mechanism in its referred form does not remove any stock, vhave used the term punch memagainst. one wall, the ends olf the cutters abutber simply to render reference to the location ting against each other.

and general relative movement more easy. It is obvious that the upperl member might be stationary and the lower member movable.

What I claim is:

1. Slitting mechanism comprising spaced. rows of punch and die cutters arranged in staggered relation, the cutters in each row abutting against each other at the ends and being beveled on the corners and beveled on the aces away l'rom the cutting edges.

2. Slitting mechanism comprising spaced. rows ol' punch and die cutters arranged in staggered relation, the cutters in each row abutting against each other at the ends and being beveled on the corners and beveled on the laces -awa)T i'rom the cutting edges, the cutting edgesol'the back punch cutters being also crowned or sloped toward the corners.

3. Slitting mechanism comprising double rows ol' llat punch and die cutters arranged in staggered relation, the cutting edges ol' the l'ront punch cutters and ol' all the die cutters being straight across and the cutting edge ol' eaclh back punch cutter sloping toward the enr s.

10. Slitting mechanism including a holder having a groove, two rows olL cutters iii said groove and abutting against each other, means lor clamping the cutter in one row to one wall olI the groove and means l'or clamping the cutters in the other row to the opposite 'w all olI the groove. 11. Slitting mechanism including a holder having a groove, two rows ol' cutters in said groove and abutting against each other, means l'or clamping the cutters in one row to one wall olI the groove, and means l`or clamping thecutters in the other row to the opposite wall ol' the groove, and means l'or clamping the two walls ol' the holder toward each other.

12. Slitting mechanism including a holder, a row ol' cutters abutting againsteach other and beveled on their corners, each cutter havingran open recess at its end and bolts passing through said recesses and clamping the cutters in the holder.

13. Slitting mechanism including a holder, a row oll cutters and clamp bolts passing between thc ends ol adjacent cutters and each holding two cutters in place.

ice

4. Slitting mechanismA comprising two 14. Slitting mechanism including-a grooved rows ol punch cutters and two rows oi die holder, two, spaced rows of cutters in staggered rclation in the groove, rclamp bolts cutters all arranged in transversely staggered passin'g between the ends of adjacent cutters and `c1arnp nuts on the bolts between l the rows of cutters.

15. Slitting mechanism includinga grooved holder, two spaced rows of'cutters in stag-V gered relation 1n said groove, clamp bolts passing between the adjacent cutters lof one row, and other clamp bolts assing between the adjacent cutters of the ot er row.

16. Slitting mechanism includingagrooved holder, two spaced rows of cutters in staggered relation in said groove, clamp boltspassing between the adjacent cutters of one row, and other clamp bolts passing between the adjacent cutters of the other row, some of said bolts extending throu h the cutters which are opposite the lnterva of the cutters row with their cutting faces against one ofv the lower walls.

18. Slitting mechanism comprising up er and lower holders, each having arallel wa s, two rows of cutters for each ho der, the cutters of each row being ilat and abutting on the ends, the cutters of one upper and one lower row forming a set re lstering with each other and being staggere with relation to the registering cutters of the other set, the cutting sides of the cutters of one upper row and the cutting sides of the relatively staggered lower' row bearing against opposite Walls of the upper and lower holders.

19. Slitting mechanism includin upper and lower holderseach having a at continuous vertical wall, and two sets of flat cutters in staggered relation in each holder, the cutting sides of the cutters in one row of each set being held to and bearing against the wall of its holder.

k20. Slitting mechanism including upper and lower holders each having a flat continuous vertical wall and two sets offiat cutters in staggered relation in each holder, the cutting sides of the cutters in one row of each set being held to and bearing against' the wall of its holder, and ilat continuous vertical bearing walls for the opposite sides of the other cutters of each holder.

21. Slitting mechanism com )rising upper and lower sets of transverse y extending sta gered cutters having beveled cuttin(T faces am? holders for said sets su )porting eai cutter throughout substantialiy its entire height from the back ends to the base of the bevel. 22. In sheet metal slitting mechanism, a holder having a transverse groove with parallel o posite walls, two rows of cutters ar- `range 1n said groove in staggered relation and means for rigidly securlng said cutters in parallel alinement with the opposite walls of said groove, the cutting edges projecting beyond the groove a distance substantially equal to the thickness of stock to be slitted.

In testimony whereof I afiix my signature in presence of two witnesses.

NORRIS ELMORE CLARK.

Witnesses D. G. CLARK, A. V. BROCK. 

